18-7632-1

The Sierra Marine IAC Motor, model number 18-7632-1, is an essential component of the marine fuel injection system. This idle air control motor plays a crucial role in maintaining consistent engine performance and optimal fuel efficiency while the engine is idling or at low RPMs.

The motor is designed with a robust, marine-grade construction, ensuring it can withstand the harsh marine environment. Its housing is made from cast aluminum, providing both durability and excellent heat dissipation capabilities. The motor also features a high-temperature, chrome-plated armature to resist corrosion and wear over time.

The Sierra Marine IAC Motor operates using a simple yet effective design. It consists of a rotor and a stator, which interact to control the amount of air that enters the engine during idling. This control results in a stable engine speed and improved fuel economy. The motor is designed to seamlessly integrate with most marine fuel injection systems, making it a versatile solution for various marine applications.

This motor is easy to install, with clear mounting instructions included in the packaging. It also features a straightforward electrical connection, allowing for a quick and hassle-free installation process. Additionally, the motor comes with a built-in thermal overload protection feature, which safeguards the motor against overheating and potential damage.

In summary, the Sierra Marine IAC Motor, model number 18-7632-1, is an indispensable component for any marine engine. With its rugged construction, effective design, and ease of installation, this motor ensures consistent engine performance and optimal fuel efficiency during idling conditions. Its marine-grade materials and protection features make it an ideal choice for various marine applications.

The Sierra Model 18-7632-1 Marine Idle Air Control Motor is a crucial component in the combustion system of marine engines. It regulates the amount of air entering the engine during idle operation to ensure proper fuel-air mixture and smooth engine performance. Here are some pros and cons of buying this particular idle air control motor.

1. Improved Idle Stability: This motor can help maintain a consistent engine idle speed, which is essential for safe and efficient operation of the marine engine.

2. Enhanced Engine Performance: Proper idle air control can lead to improved engine performance and fuel efficiency.

3. OEM Quality: This motor is a direct replacement for original equipment manufactured by Mercury Marine, ensuring a reliable and accurate fit for Mercury engines.

4. Easy Installation: The motor is designed to be a direct replacement, making the installation process relatively straightforward.

5. Reduced Emissions: Proper idle air control can help reduce harmful exhaust emissions, contributing to a cleaner marine environment.

1. Potential for Leaks: As with any marine engine component, there is a risk of leaks when installing a new idle air control motor. Be sure to follow proper installation procedures and use appropriate sealing materials.

2. Cost: This motor may be more expensive compared to aftermarket alternatives, but the OEM quality and ease of installation may justify the investment for some.

3. Limited Compatibility: This motor is designed specifically for Mercury Marine engines, making it less versatile for other marine engine brands.

In conclusion, the Sierra Model 18-7632-1 Marine Idle Air Control Motor offers several benefits, including improved idle stability, enhanced engine performance, OEM quality, easy installation, and reduced emissions. However, potential drawbacks include the risk of leaks, higher cost, and limited compatibility with engines other than Mercury Marine. Ultimately, if you own a Mercury Marine engine and are experiencing issues with idle stability or performance, this motor may be a worthwhile investment for smoother, more efficient operation.

Details:

This idle air control motor iMac motor is designed to regulate the engine speed by controlling how much bypasses throttle plate when idling helping maintain a smooth and stable preventing stalling or erratic behavior. This kit includes the idle air control motor and necessary gasket for installation. Fits / compatibility, this Sierra idle air control motor fits the following Marine applications equipped with electronic fuel injection ecm 555: Mercuries Cm moi engines: 3.0l l4, v-6 305 CID 350 CID, v-8 496 these are commonly found on stern drive and inboard engines that utilize a 805224a1. This Sierra part replaces the following oem/aftermarket numbers: Mercuries / quicksilver: 805224a1, crusader: 47033, Mallory Marine: 9-33401, note: always verify number on your original component or engines service manual to ensure correct fitment.

Up for sale is a Sierra Marine idle air control motor kit part 18-7632-1. Its a solid replacement for worn or failed idle air control motors on compatible Marine engines and is built to meet exceed oem specifications. Features, direct replacement idle air control motor, helps maintain stable and engine performance, meets or exceeds oem quality standards, includes throttle body gasket for easy install Mallory Marine: 9-33401.

specifications inboardfuel:

• for models: Marine
• brand: Sierra
• mpn: 18-7632-1
• part type: Control Motor

shipping inboardfuel:

• type: calculated
• carrier: usps
• class: standard
• service: usps ground advantage
• transit: 4-11 days

payments inboardfuel:

• other
• wallet: apple-pay
• credit card: mastercard

returns inboardfuel:

• policy: no returns

general inboardfuel:

• category: Boat Parts > Inboard Engines Components > Intake Fuel Systems

seller inboardfuel:

• city: adel, iowa
• # reviews: 61
• rating: 100.0%

offer inboardfuel:

• prices: $101.77–$130.40
• item condition: New
• started: february 8, 2026
• in stock #: 5
• sold #: 11
• options: ship-to-home
• best offers: true
• availability: in stock

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